how to fix a misfire in my Toyota Corolla E170 (2013-2019) engine

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Sub-steps:
  1. Locate the spark plugs on the engine.
  2. Remove the ignition coil (if applicable) by unscrewing the bolts and disconnecting the electrical connector.
  3. Use the spark plug socket to remove the old spark plugs from the cylinder head.
  4. Inspect the condition of the spark plugs; replace if damaged or fouled.
  5. Gap the new spark plugs according to manufacturer specifications.
  6. Install new spark plugs and torque them to the recommended specification (typically around 13-15 ft-lbs).
  7. Reinstall the ignition coils, ensuring they are seated properly.

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set, multimeter.
• Sub-steps:
  1. Using the multimeter, check the resistance of each ignition coil (normally between 0.5-2 ohms).
  2. If any coil is faulty, remove it by unscrewing the mounting bolts and disconnecting the electrical connector.
  3. Install the new ignition coil by connecting the electrical connector and securing it with the bolts.

4. Check Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if cleaning), socket set.
• Sub-steps:
  1. Locate the fuel rail and remove the fuel injectors.
  2. Inspect the injectors for clogs or leaks.
  3. If necessary, clean or replace the fuel injectors, ensuring they are properly seated during reinstallation.

5. Inspect Air Intake and MAF Sensor

• Tools Required: Screwdriver set, cleaning spray for MAF sensor.
• Sub-steps:
  1. Inspect the air intake hoses for cracks or leaks.
  2. Remove the MAF sensor and clean it with MAF cleaner.
  3. Reinstall the MAF sensor and ensure all connections are secure.